【網線(xian)連(lian)接(jie)(jie)器對(dui)(dui)接(jie)(jie)頭(tou)】網線(xian)連(lian)接(jie)(jie)器的應用 網線(xian)連(lian)接(jie)(jie)器對(dui)(dui)接(jie)(jie)頭(tou)使(shi)用注(zhu)意事項
網線連接器的應用
網線連接器對接(jie)(jie)頭通(tong)(tong)常用(yong)作(zuo)以太網連(lian)(lian)接(jie)(jie)器,TR-42.9在(zai)選型一種工(gong)(gong)業(ye)適(shi)(shi)用(yong)的(de)(de)連(lian)(lian)接(jie)(jie)器接(jie)(jie)口(kou)方面已經有了(le)(le)很大的(de)(de)進展。ODVA(開放設(she)備網絡賣方協會(hui))和JSIG(控制網絡行業(ye)小(xiao)組)正在(zai)為一種以太網工(gong)(gong)業(ye)協議(EtherNet/IP)發展標(biao)準。該(gai)連(lian)(lian)接(jie)(jie)器將軍用(yong)的(de)(de)連(lian)(lian)接(jie)(jie)器引用(yong)到普通(tong)(tong)的(de)(de)出(chu)工(gong)(gong)業(ye)用(yong)RJ45,RJ11,USB,1394等連(lian)(lian)接(jie)(jie)器,再這些連(lian)(lian)接(jie)(jie)器外面加上圓形的(de)(de)金屬或塑料的(de)(de)保(bao)護殼體,使(shi)之防水防塵等級達到IP67。普通(tong)(tong)的(de)(de)RJ45,RJ11,USB,1394等連(lian)(lian)接(jie)(jie)器不(bu)(bu)需要(yao)斷開重新壓接(jie)(jie)或焊(han)接(jie)(jie),保(bao)證了(le)(le)信號(hao)不(bu)(bu)發生衰減,同(tong)時不(bu)(bu)需要(yao)任(ren)何的(de)(de)安裝工(gong)(gong)具(ju),節約工(gong)(gong)時,降(jiang)低成本。除了(le)(le)規定連(lian)(lian)接(jie)(jie)器接(jie)(jie)口(kou)外,TR-42.9還定義了(le)(le)接(jie)(jie)口(kou)必須適(shi)(shi)合的(de)(de)環(huan)境要(yao)求。
連接器(qi)產品通常(chang)給用戶典型辦公(gong)環(huan)境下(xia)多年的可(ke)靠服務(wu)保證。但是如(ru)果將連接線銅纜或光(guang)纖置(zhi)于極端的灰塵,溫(wen)度,潮氣(qi),電磁(ci)干擾或振動(dong)(dong)環(huan)境下(xia),則(ze)性能和可(ke)靠性將受到(dao)損害(hai)。事實(shi)上(shang),上(shang)述的一些或所有因(yin)素在(zai)我們日常(chang)環(huan)境是會經常(chang)發生(sheng)的,典型的適配連接器(qi)(如(ru)RJ-45RJ-11,1394等插頭和插座),布置(zhi)的網絡將無縫延伸至工廠場所。在(zai)工業以太(tai)網應用中(zhong)必(bi)將得益(yi)的范例包括(kuo)采(cai)礦業,精煉廠,自動(dong)(dong)設備,生(sheng)產車(che)間。
網線連接器對接頭使用注意事項
1、腐蝕
工(gong)業環境下是(shi)(shi)經常會遇見腐蝕(shi)性氣體和(he)(he)液體情況(kuang)的。象油,氣和(he)(he)化學(xue)物(wu)質能侵蝕(shi)外面的連接(jie)器互蓋,插(cha)頭和(he)(he)插(cha)座的金屬腳,線纜(lan)外套等(deng)。極(ji)端溫(wen)度(du):連接(jie)器一般(ban)能忍受-10---60度(du)的溫(wen)差,對(dui)于絕大部分辦(ban)公和(he)(he)一般(ban)工(gong)業環境是(shi)(shi)沒有問題的。但(dan)是(shi)(shi),如果放在極(ji)端的惡劣溫(wen)度(du)環境下,超過(guo)范圍的溫(wen)度(du)會導致傳輸錯誤和(he)(he)可靠性問題。
2、震動
當置于極端震動環境,標準(zhun)連接器會(hui)起(qi)反作(zuo)用力。經過一端時間后(hou),插頭和插座(zuo)的連接將會(hui)逐漸磨(mo)損,針腳在連接點會(hui)凹陷(xian)下去,降(jiang)低可靠性。而且(qie),在這種(zhong)磨(mo)損過后(hou),如暴露于蒸汽環境,又會(hui)進一步引起(qi)腐蝕。
3、電磁
嚴(yan)重的(de)電磁(ci)干擾源通(tong)(tong)常有(you)(you)臨近數據(ju)通(tong)(tong)路的(de)生(sheng)產設備,電力通(tong)(tong)道等。機器和電通(tong)(tong)路產生(sheng)電場,并(bing)能耦(ou)合(he)入(ru)數據(ju)通(tong)(tong)路中導致噪音,破壞數據(ju)信號的(de)完(wan)整(zheng)性。有(you)(you)時(shi)在安(an)裝時(shi)會有(you)(you)部(bu)分或整(zheng)個地點由于(yu)環境因(yin)素產生(sheng)連接性問題,如可能被水浸的(de)房(fang)間和易于(yu)粘灰的(de)區域,及位于(yu)極端溫度環境下的(de)地點。
4、進水
網絡接頭進水通常(chang)有兩(liang)種(zhong)表現,一(yi)(yi)種(zhong)是(shi)接頭(tou)(tou)(tou)進水導致電(dian)(dian)(dian)纜部分進水,引起中間絕緣層介電(dian)(dian)(dian)系數變(bian)化,電(dian)(dian)(dian)纜衰(shuai)減(jian)增大(da),尤(you)其(qi)是(shi)對高頻信(xin)號,在用戶端反(fan)映為高端信(xin)號變(bian)差,雪花點(dian)變(bian)多,在干線上表現為放大(da)器輸(shu)出電(dian)(dian)(dian)平斜率(lv)(lv)很小或為負值(如果(guo)是(shi)傾斜輸(shu)出的話);另外一(yi)(yi)種(zhong)表現是(shi)接頭(tou)(tou)(tou)進水會使(shi)接頭(tou)(tou)(tou)氧化,尤(you)其(qi)是(shi)共纜饋電(dian)(dian)(dian)的線路,從而使(shi)供電(dian)(dian)(dian)出現故障,影響整個(ge)下游放大(da)器正常(chang)工作(zuo),同時(shi)伴隨斜率(lv)(lv)變(bian)大(da),信(xin)號質量惡化。
現有(you)電纜一般內(nei)導(dao)體為銅(tong)(tong)(tong),外導(dao)體為鋁鎂合金絲或鋁殼。內(nei)導(dao)體和外導(dao)體在空(kong)氣中(zhong)都(dou)會氧(yang)(yang)化,尤(you)其是在有(you)水(shui)的(de)環境中(zhong)。銅(tong)(tong)(tong)在常(chang)溫和高(gao)溫下(xia)都(dou)可以(yi)發生氧(yang)(yang)化,生成(cheng)黑色的(de)氧(yang)(yang)化銅(tong)(tong)(tong)和堿式(shi)碳酸銅(tong)(tong)(tong),俗稱銅(tong)(tong)(tong)綠,但堿式(shi)碳酸銅(tong)(tong)(tong)在高(gao)溫下(xia)可以(yi)分解成(cheng)氧(yang)(yang)化銅(tong)(tong)(tong)。這兩種氧(yang)(yang)化產物都(dou)是電絕緣體且不(bu)溶于(yu)水(shui),對(dui)有(you)線電視傳輸系(xi)統的(de)饋電及(ji)信號傳輸都(dou)有(you)很(hen)大影響(xiang)。